Your hands/fingers seizing up, you mean like they lock in an odd and painful position? If so, it is commonly called "trigger", but I get that from my RA, not sure if Lupus does that, but then Lupus can mask RA so it;s hard to tell.
Babs is right, call your doc. For me, ibprofen, plus cortisone shots helps immensely, although I am not supposed to take ibprofen
Hope this helps
PS, I would put my hands in a warm water soak, then massage the tendon till the trigger would leave.
A/Fib, diagnosed Aug, 1997, R/A diagnosed in Sept. 1998, Pericarditis and Lupus in Dec, 2003, Diabetes, diagnosed march, 2004
sotalol, digoxin, coumidin, plaquenil, prednisone, metformin, diamacron, wellbutrin,fenofibrate